/*
 * Copyright (C) 2009 Leandro de Oliveira Aparecido <lehphyro@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.code.japa.repository.ret;

import java.lang.reflect.*;

import com.google.code.japa.annotation.*;
import com.google.code.japa.repository.*;

/**
 * Discovers method parameter names of elements annotated with
 * {@link com.google.code.japa.annotation.RepositoryReturn}.
 * 
 * @author Leandro Aparecido
 * @since 1.0
 * @see org.springframework.core.ParameterNameDiscoverer
 * @see com.google.code.japa.repository.RepositoryAnnotationParameterNameDiscoverer
 */
public class RepositoryReturnAnnotationParameterNameDiscoverer extends RepositoryAnnotationParameterNameDiscoverer {

	/**
	 * {@inheritDoc}
	 */
	public String[] getParameterNames(Method method) {
		String[] parameterNames = null;
		RepositoryReturn annotation = method.getAnnotation(RepositoryReturn.class);
		if (annotation != null) {
			parameterNames = getParameterNames(annotation.argNames());
		}

		return parameterNames;
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings("unchecked")
	public String[] getParameterNames(Constructor constructor) {
		String[] parameterNames = null;
		RepositoryReturn annotation = (RepositoryReturn) constructor.getAnnotation(RepositoryReturn.class);
		if (annotation != null) {
			parameterNames = getParameterNames(annotation.argNames());
		}

		return parameterNames;
	}

}
